README.markdown in riemann-dash-0.2.11 vs README.markdown in riemann-dash-0.2.12

@@ -29,9 +29,14 @@
 set :port, 6000      # HTTP server on port 6000
 set :bind, "1.2.3.4" # Bind to a different interface
 config[:ws_config] = 'custom/config.json' # Specify custom workspace config
 ```
 
+You can also specify the default config file to be used by setting the
+`RIEMANN_DASH_CONFIG` environment variable. If set, this value will override
+the default config file location of `config.rb` when no config file is passed
+on the command line.
+
 Putting in production
 =====================
 
 If you expect more than a couple of simultaneous users, you should consider
 running Riemann-dash in a proper application server. The easiest way is to